Trout and salmon populations, which play a critical role in many ecosystems and economies, have dramatically declined in the Pacific Northwest (PNW) due to habitat degradation and fragmentation and introductions of invasive species, and are expected to be further impacted by future climate change. Understanding how climate change will influence the abundance, distribution, genetic diversity, and value of these native fish species is crucial for their management and recovery. This project will use modeling techniques to study how climate change might affect freshwater habitats of key trout and salmon species throughout the PNW. The goal of the study is to develop and provide novel tools that will help managers predict and respond to potential climate change induced impacts on habitats, populations, and economies.